Brine Turbidity Continuously Monitored In-Line

Teflon-lined turbidity flow cell assembly shown open.

Model AP-VIE Indicator/Controller

MODEL AP-VIE The Model AP-VIE does not require an additional box, but has alarm relay controls and isolated 4-20mA outputs. Request A89-50 flyer for additional information.

Problem: Brine used for chlorine extraction needs to be free of contaminants before extraction operations commence.

A Compton, California-based chemical manufacturer extracts chlorine from brine through the use of mercury cells. Because mercury cells are highly sensitive to particular contaminants- vanadium, for example, impinges on operations if present at concentration levels of 20 ppm or higher-the company treats and filters the brine prior to beginning the extraction process.

To guard against contaminants getting through the treatment and filtering processes the company required a method to continuously monitor the brine after filtration and prior to its entering the mercury cells.

Solution: McNab AP-VIE turbidimeters were installed on each of the three heavy-duty discharge lines lending from the pressure-leaf filters to the mercury cells.

Each of the turbidity monitoring systems consist of a flow cell, on which two housings are opposite-mounted. One housing contains a light source and the other contains a measuring detector. The flow cell is connected to an indicator/ control cabinet housing the electronics and alarm.

The brine flows through the flow cell at 150 F and at 60 psi . The light source continuously sends a light beam through the brine to the photoelectric scanner in the measuring detector which then sends electric signals relating to the amount of light it is receiving to the indicator/control cabinet where the signals are converted to a turbidity value and displayed. Particles in the brine decrease the light reaching the scanner. When solids content reaches a pre-set value, the turbidimeter system triggers an alarm in the control room to alert operators to a potential contaminant problem. The operators take a sample of the filtrate and compare it to a known standard. If the excess turbidity is verified sluicing and backwash operations are commenced in the filters.

Questions? Contact McNab

A92-41B
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